Octafluorobutane compositions

Abstract

Compositions of octafluorobutane and a compound of the formula C a F b H 2a+2-b , where a=3 or 4 and b=1 to 8 are disclosed. These compositions, may be azeotropic or azeotrope-like, and may be used as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents or displacement drying agents.

What is claimed is: 
     
       1. An azeotropic or azeotrope-like composition consisting essentially of: (a) 1-80 weight percent 1,1,2,2,3,3,4,4-octafluorobutane and 20-99 weight percent 1,1,1,2,2,4-hexafluorobutane wherein when the temperature has been adjusted to about 25° C., the vapor pressure of the composition is higher than the vapor pressure of the individual components;   (b) 1-60 weight percent 1,1,2,2,3,3,4,4-octafluorobutane and 40-99 weight percent 1,1,1,3,3-pentafluorobutane wherein when the temperature has been adjusted to about 25° C., the vapor pressure of the composition is higher than the vapor pressure of the individual components;   (c) 1-75 weight percent 1,1,2,2,3,3,4,4-octafluorobutane and 25-99 weight percent 2,2-difluorobutane wherein when the temperature has been adjusted to about 25° C., the vapor pressure of the composition is higher than the vapor pressure of the individual components; or   (d) 1-80 weight percent 1,1,2,2,3,3,4,4-octafluorobutane and 20-99 weight percent 2,3-difluorobutane wherein when the temperature has been adjusted to about 25° C., the vapor pressure of the composition is higher than the vapor pressure of the individual components.   
     
     
       2. A process for producing refrigeration, comprising condensing a composition of claim 1 and thereafter evaporating said composition in the vicinity of the body to be cooled. 
     
     
       3. A process for producing heat comprising condensing a composition of claim 1 in the vicinity of a body to be heated, and thereafter evaporating said composition.